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-rw-r--r--stdlib/mbtowc.c84
1 files changed, 26 insertions, 58 deletions
diff --git a/stdlib/mbtowc.c b/stdlib/mbtowc.c
index fd94492..c340dd7 100644
--- a/stdlib/mbtowc.c
+++ b/stdlib/mbtowc.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991, 1992, 1995 Free Software Foundation, Inc.
+/* Copyright (C) 1991, 1992, 1995, 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -16,73 +16,41 @@ License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
-#include <ansidecl.h>
-#include "../locale/localeinfo.h"
-#include <ctype.h>
-#include <stddef.h>
-#include <stdio.h>
#include <stdlib.h>
-#include <string.h>
+#include <wchar.h>
-long int _mb_shift = 0;
+/* Common state for all non-restartable conversion functions. */
+mbstate_t __no_r_state;
/* Convert the multibyte character at S, which is no longer
than N characters, to its `wchar_t' representation, placing
- this n *PWC and returning its length. */
+ this n *PWC and returning its length.
+
+ Attention: this function should NEVER be intentionally used.
+ The interface is completely stupid. The state is shared between
+ all conversion functions. You should use instead the restartable
+ version `mbrtowc'. */
int
-DEFUN(mbtowc, (pwc, s, n), wchar_t *pwc AND CONST char *s AND size_t n)
+mbtowc (wchar_t *pwc, const char *s, size_t n)
{
-#if 0
- register CONST mb_char *mb;
- register wchar_t i;
-#endif
-
+ int result;
+
+ /* If S is NULL the function has to return null or not null
+ depending on the encoding having a state depending encoding or
+ not. This is nonsense because any multibyte encoding has a
+ state. The ISO C amendment 1 corrects this while introducing the
+ restartable functions. We simply say here all encodings have a
+ state. */
if (s == NULL)
- return _mb_shift != 0;
-
- if (*s == '\0')
- /* ANSI 4.10.7.2, line 19. */
- return 0;
-
- if (isascii (*s))
- {
- /* A normal ASCII character translates to itself. */
- if (pwc != NULL)
- *pwc = (wchar_t) *s;
- return 1;
- }
-
-#if 0
- if (_ctype_info->mbchar == NULL ||
- _ctype_info->mbchar->mb_chars == NULL)
- return -1;
+ return 1;
- if (n > MB_CUR_MAX)
- n = MB_CUR_MAX;
+ result = mbrtowc (pwc, s, n, &__no_r_state);
- for (i = 0; i < WCHAR_MAX; ++i)
- {
- mb = &_ctype_info->mbchar->mb_chars[i];
- /* EOF and NUL aren't MB chars. */
- if (i == (wchar_t) EOF || i == (wchar_t) '\0')
- continue;
- /* Normal ASCII values can't start MB chars. */
- else if (isascii(i))
- continue;
- else if (mb->string == NULL || mb->len == 0)
- continue;
- else if (mb->len > n)
- continue;
- else if (!strncmp(mb->string, s, mb->len))
- {
- _mb_shift += mb->shift;
- if (pwc != NULL)
- *pwc = i;
- return mb->len;
- }
- }
-#endif
+ /* The `mbrtowc' functions tell us more than we need. Fold the -1
+ and -2 result into -1. */
+ if (result < 0)
+ result = -1;
- return -1;
+ return result;
}